Automatic prick-punch.



No. 789,520, PATENTED MAY 9, 190,5. J. A. ADBLL @L J. L. BALTZER.

AUTOMATIC PBIGK PUNCH.

APPLICATION FILED MAR. 2s, 1905I` raras Patented May 9, 1905.

JOHN A. ADELL AND JOHN L. BALTZER, OF ATHOL, MASSACHUSETTS, ASSlfG-NORS TO L. S. STARRET OO., OF ATHOL, MASSACHUSETTS, A CORPORATION OF lVIASSAOHUSETTS.

SPECIFICATION forming part of Letters Patent No. 789,520, dated May 9, 1905. Application filed March 28, 1905. Serial No. 251,567.

To rtZZ whom, 'it may (1e/tecra: v

Be it known that we, JOHN A. ADELL and Jol-.1N L. BALTZER, of Athol, in the county of ll'lorcester and State of h/lassachusetts, have `jointly invented certain new and useful Improvements in Automatic Frick-Punches, otl which the following is a specilieation.

The object o't' this invention is to provide an automatic prick-punch of improved construction, compact, self-contained, and adjustable to strike a heavier or lighter blow by the spring-actuated hammer, the tool being iinely iinishcd and not much larger than the ordinary solid punch.

The body oi' our improved punch is formed hollow in three sectionsconnected terminally, the middle section having fixed within it a slotted lining-shell having' a cam-like aperture and inclosing a short movable shell with twin slots, these parts, together with two springs, serving to operate the hammer and through an interposed reciprocating piece drive the punch-point.

ln the drawings, Figure 1 is a plan oi the tool complete, and Fig. 2 an axial section thereof. Fig. 3 is a longitudinal section through the three-part outer shell, the inclosed parts, including the lining-shell, being Ain elevation and the movable inner shell indicated by dotted lines. Fig. 4 is a transverse section on line 4 4 oi Fig. 3, double size. Fig. 5 a longitudinal section, similarlyenlarged, showing the adjustable shell-cap. Fig. 6 is a plan oi' the liningshell blank, and Fig. 7 a sectional detail showing positions at the instant the hamn'ier-blow is struck.

The body or external shell of the tool consists oil the knurled cylindrical middle section 8, externally threaded at each end, and the cap or head 9 and tapering' tip-section 10 screwed thereon, all having the appearance of being formed in a single piece. The middle section 8 has a thin steel lining 11 forced into it and permanently secured in place therein. This lining-shell11 is formed, preferably, Yfrom a sheet-metal blank, as illustrated in Fig. G, with a longitudinal slot 12 and a camshaped recess 13, as shown in Fig. 3, the Function oi which will be explained presently.

lVithin the recessed end of the lining-shell 11 is a movable actuating-shell 111, open at one end to admit the reduced stem of the reciprocating hammer 15 and having through its opposite sides open slots 16, to be traversed at the proper time by the projecting ends of a transverse pin 17, extending through the hammer-stem. (See Figs. 2, 4C, and 5.) The body oi the hammer [its loosely within the lining-shell 11 and has a projecting shoulder .18, to which is applied the pressure ot' 60 the driving-spring 19, located Within cap 9. Such pressure may be varied in its Vtorce by partially unscrewing said cap, as illustrated in Fig` 5.

The ti p-seetion 10 has an axial perforation, 65 from which the punch 20 protrudes, its head engaging an internal shoulder, as in Figs. 2 and 8, to prevent it `from droliipiug out and to form a proper stop. Adjacent to the punchhead is a headed reciprocating extension-piece 7o 21, which passes freely through a lixed washer 22 and is screwed at tip into the outer end of actuating-shell 1A and secured permanently thereto. The washer 2Q is forced into the enlarged end of tip-section 10 and held 'fast 75 between it and the end oi" body 8. A coiled spring' 23 surrounds the reciprocatingl piece Q1 and issccured at one end in said piece and at the opposite end in a recess 24 in washer 22. (See Figs. 2 and 5.) This spring serves to 8o untwist or restore to place the actuating-shell 14 when the hainn'ier-blow is struck.

The operation is as follows: Then the operator presses the tip of punch 2O against the material to be indented, the pressure is coni- S 5 municatcd by piece 21 to the actuating-shell 1LT, the inner end oi" which bears against the end portions oi the hammer-lifting pin 17, thus compressing the two springs 19 and 23 preparatory to the driving blow. The actu- 9c ating-shell 14 has a short projecting stud 25, which extends into the cam-shaped aperture 13 oi lining-shell 11 and bears against the edge wall thereof. Hence when punch 2O and shell 14 are pushed rearwardly the cam-wall at the inner end of said aperture deilects the stud 25 from a straig'ht course, imparts a torsional strain to spring 23, and gives to the actuatingshell 14 a partial oscillation sufhcient to bring' the open ends of the slots i16 in said shell into the plane of the transverse pin 17, whereupon the projecting ends of said pin enter these slots, the pin no longer supports the hammer, and the compressed spring's 19 and Q3 force the hammer forward, and its reduced end strikes the inner end of the reciprocating piece 21, which transmits the blow to punch 20. (See Fig. 7.) The recoil of spring' 23 permits it to somewhat untwist, such action being also promoted by the oblique outer end wall of recess 13, against which stud 25 impinges. Shell 14 is thus restored to its normal position, as seen in Fig. L1, the punch 2O protrudes, and the operation is repeated indefinitely.

Te claim as our joint invention-- 1. In an automatic prick-punch, the threepart hollow body, comprising' the tip-section, the main body and the end cap, united terminally, the middle section having' a rigid inner wall or lining' longitudinally grooved or slotted and an oblique-ended recess or aperture, and provided with a movable, inner actuating-shell having' a stud extending' into said recess, in combination with the punch-point and its extension-piece reciprocating within the tip-section, the driving-spring inclosed within the end cap, and the reciprocating' hammer, driven by said spring retracted by pressure against said point and otherwise actuated by the movable shell, substantially as set forth.

2. In an automatic prick-punch, the external body composed of three tubular sections con nected terminally, the middle section being provided with a fixed metallic lining-shell, slotted longitudinally and formed with an elongated recess having oblique ends, such middle section being' also furnished with a movable actuating-shell, open at its inner end, longitudinally slotted through its side and having ashort radial stud extending' into said recess, in combination with the driving-spring', the reciprocating hammer reduced at tip to enter the actuating-shell and provided with a transverse stud or pin adapted to bear against the end of said shell and also to traverse the slot therein when the hammer-blow is struck, and with the punch-point and its reciprocating' extension-piece secured axially to the outer end of the actuating-shell, substantially as set forth.

3. The described self-contained automatic prick-punch having' a sectional hollow external shell, a driving-spring' 19 inclosed within the end cap, a longitudinally-slotted lining' 11, fixed within the central part of the outer shell, such lining formed with an oblique-ended recess 13, andan axial reciprocating' hammer 15 having a transverse lifting-pin 17 projecting' endwise into the slots of the actuating-shell and the longitudinal slot in said lining', in combination with the tapering tip-section 10 internally shouldered, the reciprocating punch 2O and the sliding and oscillating piece 21 therein, said piece extending through a fixed washer 22 and a torsion-spring Q3 connected terminally to said piece and washer, and with the actuating-shell 14: slotted in its sides, secured axially to piece 21, provided with a radial stud Q5, and serving', when the punch is retracted, to compress and then release the driving-spring', substantially as set forth.

In testimony whereof we have affixed our signatures in presence of two witnesses.

JOHN A. ADELL. JOHN L. BALTZER. lVitnesses:

L. S. STARRETT, FRANK E. W ING. 

